Furnace



Feb.17.1925, 1,526,891

E. K. ANDERSON FURNACE Filed Jan.' 2s, 1924 Patented Feb. 17, 1925.

UNITED STATES ERNEST K. ANDERSON, OIE PORTLAND, OREGON.

FURNACE.

.Application filed. January 23, 1924. Serial No. 687,945.

7, 1o all 107mm t may concern.'

Be it hereby known that I, ERNnsT K, ANDnnsoN, a citizen of the United States, and a resident of Portland, in the county of Multnomah and State of Gregon, have invented a new and useful Furnace, of which the following is a specification.

This invention relates more particularly to furnaces for warming air with gas or liquid fuels.

An object of my invention is the construc tion of a warm air furnace in which the air space is kept as large as possible for a given outside dimension of a furnace.

A second object is to so construct t-he furnace that the condensation can be gathered and drawn off without maintaining a sufiicently high stack temperature to carry the moisture off with the burned gases.

A third object is to reduce the corrosive effect of the moisture which is formed when burning hydro carbons by draining the condensed moisture 0E as rapidly as it is formed, and by rendering it possible to keep the metal in the furnace at a lower tempera.- ture and therefore less subjectfto corrosive action than is ordinarily possible.

A. fourth object is to so construct the air flues that they cannot become air-bound.

A fifth object is the elimination of dead air space above the lire bo-X by inclining the tubes towards the center of the furnace.

A sixth object is to avoid the use of a top or head over the combustion chamber from which it is difficult to conduct the heat, which causes them to burn out very quickly.

l, accomplish these results in the manner set forth in the following specification and illustrated in the accompanying drawing, in which Figure 1 is a front elevation of the furnace with its outer casing cut away7 in section and with portions broken `awa-y for clearness. Figure 2 is a transverse section along the line 2-2 in Figure 1. Figure 3 is' a horizontal section along the line 3-3 in Figure 1.

Similar numbers of reference refer to theV same parts throughout the several views.

Referring in detail to the drawing, I have employed a fire brick or asbestos fire box 10 in the construction of my furnace whose arched top 11 is provided with openings 12A to permit the burning gas to escape into the air flue compartment. The air flues 12 are placed in double rows which incline toward the center of the furnace. The flues 12 are illustrated as square but may be of any shape other than round, for reasons which will be explained later.

Each of the flues 12 is provided at both ends with flared spacing flanges 13 which hold the flue-s a fixed distance apart. rlhe flanges 13, when assembled, form the equivalent of the sheet through which tubes are ordinarily passed.

An enclosing sheet of metal forms the sides 14, the front 15 and the back 15A. The front 15 is provided with out-turned flanges 16. A base having vertical sides 17 supports the flue` compartment over the fire box 10. An outer wall 18 ordinarily covered with a nonconductor of heat (not shown) and having a cover 19 to which are joined distributing pipes 20 is placed over the furnace and is attached to the out-turned flanges 16 in the most convenient manner.

The front wall 21 is provided with a door 22 hinged to a casting 23 and is notched at its lower end to receive the burner pipe 24 which rests in a notch in the casing 25. Baffie plates separate the flues of each pair of rows, and corner outlets 27 convey the burned gases to the smoke flue 28 by means of the back flues 29.

Drain pipes 30 carry the condensation through a hole in the floor into the earth where it can be absorbed as rapidly as formed. to connect these drain pipes to sewer systems.

The operation of my device is as follows: Gas or liquid fuel is burned inthe fire box 10 and the heat passes upward through the openings 12A against and between the inner rows of flues 12, thence over the baffles 26, thence downward around the outer rows of flues 12, and thence out through the fines 27, 29 and 28. A

The object in avoiding circular flues is to increase the air handling capacity of the furnace by increasing the area of the flues and by preventing the retarding of air flow through the tubes, as is commonly the case when heat radiates to or from the center of a circular flue.

It must be understood that when hydro carbon gases are burned that the by-product is largely water since the hydrogen in the gas unites with the oxygen of the air during combustion, and this water containing traces In some cases it may be convenient of sulphur in the form of sulphur dioxide forms liquids which readily attack the metal parts of furnaces.

It will be seen that in `my furnace this liquid is drawn off as rapidly as it is formed. The practice, therefore, has been to maintain a relatively high stack temperature,

and even to burn gas jets in fines for the purpose of carrying the moisture out by way of' the chimneys. I prefer to carry ofi this moisture as soon as it is formed and to avail myself of' the economy naturally accompanying` the reduction in stack temperature.

Another advantage which occurs in my furnace arises' from the fact that the air which'must passV through the furnace is not heated to such ahigh degree and therefore doesnot have such a low degree of humidity as is the case where hot air is given oftl by the furnace, thereby making it a real warm air furnace.

Another advantage arising` from the construction above described is the reduction in the amount of seams in the furnace, since 'the usual head or sheet through which the air fiues must pass is entirely omitted and "the fiue flanges 18 are themselves joined to- 7ings onitsupper side; rows of lsquare open" flare-ended air flues on opposite sides of said lire box, said fiues converging` at their upper ends and meeting at the center of said furnace; a wall formed around said flues adapted to confine burning gases from said combustion against the sides of said fiues; an

outlet means in said walls forVv exhausting said gases, said flues being free to receive air at their lower ends and discharge same from their upper ends.

2. A gas 'furnace having, in combination, a combustion chamber; an air flue chamber from said combustion chamber; a plurality of flare-ended square air flues passing upwardly across said combustion chamber and meeting at the top in a manner to avoid the use otI a largetop over the combustion chamber; and @means for withdrawing the byproduct wate'r which may condense on the bottom of said'ue chamber without causing same to pass out of the smoke stack or to be re-evaporated into the air passages.

3. .AL gas furnace having, in combination. a combustion chamber; a pair of rows of square-ended tiared air fiues on each side oi' said combustion chamber; a wall surrounding the sides of said fiues and said combus tion chamber, said flues converging at their upper ends toward the center of said furnace; drains for carrying off the liquid byproducts kof combustion; an outer casing completely' surrounding said flue compartment; and smoke [lues for carrying gases from around said fines out through said outer easing and into a' smoke stack.

4l. ik gas furnace having, in combination. a combustion chamber; ak double row of square air flues on each side of said combustion chamber, each-of the flues having` flared ends, 'said fiared ends being heruietically joined to` the adjacent flared ends; baflie plates betweenthe rows of each pair of rows of flues; a wall around said flues with an outer Iusing `separated from said wall; smoke flues` passing 'from said flue enclosing wallj through said outer casing; and means for draining the liquid products of coinbustion "from said' flues.

' ERNEST K. ANDERSGN. 

